Window Styles and Types of Windows for UK Homes

Choosing between different window styles is about more than appearance. The right design affects daylight, ventilation, comfort, cleaning, security, and how well your home suits its setting.

Whether you are comparing different types of windows for a new build, a renovation, or a replacement project, the best choice depends on three things. The first is style. The second is opening type. The third is frame material. There is no single best window for every home, because period houses, modern homes, upper floors, and exposed sites all have different needs.

At Idealcombi, we believe a good guide should make the decision easier. So instead of giving you a simple list, we will explain the main window styles, the most useful window opening types, where each option works best, and what to know about windows planning and planning permission for new window projects in the UK. Idealcombi’s own range also spans traditional and contemporary styles, inward and outward opening window options, and alu clad timber and aluminium composite solutions.

Casement windows are the most common and versatile choice in the UK. They are typically side hung or top hung, open widely for ventilation, and suit a very broad range of homes from cottages to new builds. Because they seal tightly when closed, they are also a strong all round choice for comfort and energy efficiency.

Sash windows are the classic option for period homes and homes that want a more traditional look. They slide rather than swing open, which makes them especially popular in Georgian and Victorian settings. If preserving character matters, sash windows are often one of the first styles homeowners consider.

Tilt and turn windows are one of the most practical modern solutions. They tilt inward for secure background ventilation and turn fully inward for cleaning and maximum airflow. They are especially useful on upper floors and in places where cleaning access matters. Idealcombi’s inward opening systems are built around exactly this kind of flexible operation.

Fixed or picture windows do not open, but they are excellent for bringing in light, framing views, and achieving strong thermal performance. They work best when paired with opening windows nearby so that you still get ventilation where you need it.

Sliding windows save space because they move horizontally rather than opening in or out. Bay and bow windows project outward and can make a room feel larger, brighter, and more architectural. Awning and hopper styles are often used where compact ventilation is more important than a full opening, such as bathrooms, utility areas, or smaller secondary spaces.

The table below sums up the ten types of windows you will see most often on UK homes, how each one opens, and where it works best. Use it as a shortlist, then read the sections that follow for the detail.

Bay and bow windows and roof windows are often listed as window types too. A bay or bow is really a layout of several windows that projects from the wall, and a roof window is defined by where it sits rather than how it opens, so we have kept them out of the table. Note that not every opening function is available in every Idealcombi series. Our team can confirm what is possible for your project.

Many people use window styles and window opening types as if they mean the same thing, but they are not always identical. A style is the overall form of the window. The opening type is the way it operates. That distinction matters when you choose windows for ventilation, cleaning, safety, and furniture layout.

The most common window opening types in UK homes are side hung casement, top hung casement, sash sliding, tilt and turn, and fixed windows. Top guided, side guided, reversible, tilt only, and turn only variations are also important depending on task and room position. Read our opening functions page on how different mechanisms solve different practical needs, from inside cleaning to night ventilation and large clear openings.

If you want a simple rule of thumb, choose casement for versatility, sash for period character, tilt and turn for easy internal cleaning and flexible airflow, and fixed windows where maximum glass and light matter most.

Most windows in UK homes open outward. Across much of continental Europe and Scandinavia, inward opening is the norm. Both work well, and the right choice depends on how you want to clean, ventilate and use the space around the window.

Outward opening windows keep the inside clear, so you can leave plants on the sill and hang blinds or curtains close to the glass. Ventilation can be controlled with a night latch, an opening restrictor or a handle operated brake. Idealcombi Futura+, Frame IC and Nation IC are outward opening, available as side hung, top guided, side guided and top swing reversible. The reversible and side guided options let you clean the outside glass from indoors.

Inward opening windows are easy to clean from inside because the whole sash opens into the room. In tilt mode they leave a small, secure gap at the top for background ventilation, and items on the sill can stay put. They also allow external shutters, flyscreens and balustrades, such as a Juliet balcony. Idealcombi Futura+i has tilt and turn as standard, with one handle switching between modes.

Inward opening windows used to be noticeably chunkier than outward opening ones. Idealcombi’s idealcore™ frame lets both use the same slim 53 mm aluminium profile, so you can mix inward and outward opening windows on one elevation without the frames looking different. Read more in our inward vs outward opening windows guide and our guide to tilt and turn windows.

For period homes, the best window styles are usually sash windows or sympathetic flush casement designs that protect the character of the building. For modern homes, slim profile casement, picture, and tilt and turn windows often work better because they suit larger glass areas and a cleaner architectural look.

For upper floors and hard to reach places, tilt and turn windows or reversible options are especially useful because they are easier to clean from inside. For living rooms and spaces where light matters most, fixed, bay, or bow windows can transform the feel of the room. For kitchens and bathrooms, styles that support controlled ventilation tend to work best.

Matching the window style to the age of your home is one of the easiest ways to keep its character. These are the window types most often found on British homes from each period.

• Georgian (around 1714 to 1830): tall, vertical proportions and multi pane sash windows with very slim glazing bars, often six over six. Symmetry across the front elevation matters.
• Victorian (1837 to 1901): sash windows with larger panes as glass got cheaper, often two over two or one over one, with sash horns and decorative surrounds.
• Edwardian (1901 to 1910): wider, lighter windows mixing sashes and casements, frequently with small paned or decorative upper lights.
• 1920s and 1930s: casement windows with top lights, sometimes with slim steel style frames or leaded glass.
• Post war to the 1980s: larger, simpler casements and picture windows. Many of these have since been replaced with uPVC.
• Cottages and rural homes: flush casement windows with small panes and flat glazing bars, traditionally painted timber.
• Modern homes and new builds: large panes, slim frames, fixed lights, floor to ceiling glazing and tilt and turn windows.

For period homes, details make the difference: the depth of the frame, how the sash sits in it, and the size and profile of any glazing bars. Our styling bars can recreate traditional pane layouts on double or triple glazed units. If your home is listed or in a conservation area, read our guide to windows for conservation areas and listed buildings before you choose.

Contemporary windows are about slim sightlines, large panes of glass and a minimal, clean finish. Frames are kept as narrow as possible so more of the opening is glass, and fixed lights are often paired with a few opening sashes. Idealcombi Futura+ is our contemporary system, with a slim 53 mm powder coated aluminium profile outside and FSC® certified timber inside. See our contemporary windows page for more.

Traditional windows borrow the proportions and details of older joinery: flush sashes, glazing bars and profiles that look like putty or a glazing bead. Idealcombi’s traditional flush casement windows come in two looks. Frame IC has an external glazing bead look, while Nation IC has a putty look designed to resemble a traditional single glazed window. Both are composite windows with timber inside and aluminium outside, and both use idealcore™ for better energy performance and lower maintenance.

Not sure which way to go? Look at the street. A contemporary window on a modern extension can sit happily alongside traditional windows on the original house, as long as the proportions relate to each other.

• Living rooms: large fixed lights for views and daylight, with side hung or tilt and turn sashes alongside for ventilation.
• Kitchens: outward opening casements or top hung windows work well over a sink or worktop, because they do not clash with taps or items on the sill. Choose a handle you can reach comfortably.
• Bathrooms: top hung or tilt and turn windows give secure ventilation, usually with obscure glass for privacy.
• Bedrooms: side hung casements with a wide clear opening. In new homes and many extensions, Building Regulations Approved Document B requires an emergency escape window in certain habitable rooms. As a guide, the openable area must be at least 0.33 m², at least 450 mm high and 450 mm wide, with the bottom of the opening no more than 1,100 mm above the floor.
• Upper floors and flats: tilt and turn, top swing reversible or side guided windows, so the outside glass can be cleaned safely from indoors.
• Loft rooms: roof windows, or dormer windows fitted with casements.

Whatever the room, you will also need background ventilation. Read our guide to trickle vents and window ventilation to see what Building Regulations ask for.

If your priorities are long term durability, slimmer sightlines, and lower maintenance on a timber look interior, alu clad windows are the stronger choice. Our composite frames combine timber and aluminium, which are designed to minimise heat loss, and use slim profiles that allow for larger glass areas and more daylight. Alu clad windows as a longer life, lower maintenance option than standard timber, with the warmth of wood inside and the protection of aluminium outside.

So, is it better to have uPVC or aluclad windows? For budget led replacements, uPVC can be the sensible answer. For homeowners who want a more architectural finish, longer service life, strong energy performance, and a premium internal feel, alu clad is usually the better fit.

The frame material changes how a window looks, how much upkeep it needs and how slim the frame can be. Here is how the four main options used in UK homes compare.

Idealcombi windows are composite: FSC® certified timber on the inside, aluminium on the outside and our insulating idealcore™ in between. The core keeps water away from the timber and removes the cavities and drainage holes found in many aluminium windows. Find out more about aluminium windows, alu clad windows and composite windows, or read our guide to composite windows.

Two windows of the same style can perform very differently depending on the glass. These are the main types of glazing to know about.

• Double glazing: two panes with a sealed gap, usually filled with argon. This is the standard for replacement windows in the UK.
• Triple glazing: three panes and two gaps, for lower heat loss, less cold radiating from the glass and less condensation. See our guides to double vs triple glazing and whether triple glazing is worth it.
• Low emissivity (low E) glass: a thin coating that reflects heat back into the room.
• Warm edge spacers: insulating spacer bars at the edge of the sealed unit that reduce heat loss and condensation around the frame.
• Toughened safety glass: breaks into small, blunt pieces. Building Regulations require safety glass in critical locations, such as low level glazing and glazing in or near doors.
• Laminated glass: a plastic interlayer holds the glass together if it breaks, which helps with both security and noise.
• Acoustic glazing: panes of different thickness and acoustic laminates to cut road, rail and aircraft noise. Read do triple glazed windows reduce noise and our noise reduction page.
• Obscure glass: patterned or frosted glass for privacy in bathrooms and side elevations.
• Solar control glass: limits overheating behind large south and west facing windows.

Fixed windows are the most energy efficient type, because there is no opening sash and so fewer seals for heat to escape through. Among opening windows, a well made casement or tilt and turn window that compresses its seals when closed performs best. In practice the glass, the frame and the installation matter more than the opening style.

Look at the whole window U-value, which measures heat loss through the frame and glass together. Lower is better. In England, replacement windows generally need a U-value of 1.4 W/m²K or better. As an indication, Idealcombi Futura+ reaches U-values from 0.74 W/m²K on a European standard size test window, and lower on larger windows. Frame IC and Nation IC are around 1.32 W/m²K with double glazing and 0.77 W/m²K with triple glazing.

Read more on energy efficient windows, how much energy efficient windows save and the Future Homes Standard.

Every window type can be made secure. What matters is the locking, the glass and how the window has been tested.

• PAS 24: in new homes, Approved Document Q requires easily accessible windows, such as those on the ground floor, to meet PAS 24 security standards.
• Secured by Design: a police backed scheme. Selected Idealcombi windows and doors have been tested and accredited. See our Secured by Design and Part Q page.
• Multi point locking: Idealcombi windows use a handle operated espagnolette that locks the sash at several points around the frame.
• Restrictors: limit how far a window opens, which is important on upper floors and in homes with young children. See handles and restrictors.
• Laminated glass: holds together under attack and is harder to break through.

• Check where it is hinged. Hinges on the side mean a side hung casement, hinges at the top mean a top hung casement. If the window slides up or down it is a sash, and if it slides sideways it is a horizontal slider.
• See which way it opens. If the handle lets the sash tilt in at the top and swing in from the side, it is a tilt and turn window.
• Look at the face of the window. If the opening sash sits level with the frame it is a flush casement. If it overlaps the frame it is a storm proof or lipped casement.
• Count the panes. Hold a small light near the glass and count the reflections. Four reflections means double glazing, six means triple glazing.
• Read the spacer bar. Many sealed units have the manufacturer and year printed on the metal or plastic strip between the panes.

For most houses in England, you do not usually need planning permission for replacement windows or new windows if they are of a similar appearance to those already used in the house. A common exception is a new bay window, which is treated as an extension and may require permission. If the new window is in an upper floor side elevation, privacy rules apply and it must be obscure glazed and either non opening or positioned so the opening part is more than 1.7 metres above the floor level.

If your property is listed, listed building consent may be required in addition to ordinary planning controls. If you are in a conservation area or your council has an Article 4 direction in place, extra restrictions can also apply. And planning permission is only part of the story. Replacement glazing falls within building regulations, and replacement windows typically need to meet thermal and ventilation requirements, including trickle vents in most cases.

If you live in a flat or maisonette, the position is stricter. Like for like replacements may not need permission, but councils vary and flats do not have the same permitted development assumptions as houses. Read more on planning permission for windows.

If your home is in a conservation area or is listed, read our guide to windows for conservation areas and listed buildings. For the ventilation rules that apply when you replace windows, see our trickle vents guide.